The effects of partial substitutions of Zn and Fe on the Cu sites in LaBa 2 Cu 3 O 7±x , and a comparison with similar substitutions in YBa 2 Cu 3 O 7-x

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@article{118aed4892a84dbc8b6d40aaead17839,
title = "The effects of partial substitutions of Zn and Fe on the Cu sites in LaBa 2 Cu 3 O 7±x , and a comparison with similar substitutions in YBa 2 Cu 3 O 7-x",
abstract = " The structural effects of Zn and Fe substitutions in LaBa 2 Cu 3 O 7-x have been examined using time-of-flight neutron powder diffraction, and compared with previous data relating to similar studies of YBa 2 Cu 3 O 7-x . Although the Fe and Zn ions display a similar site preference (for Cu(1) and Cu(2), respectively) in both systems, significant structural differences have been found. In particular, higher concentrations of dopant are possible in LaBa 2 Cu 3 O 7±x (up to 25% Cu replacement by Zn and 66% replacement by Fe), and superconductivity is rapidly destroyed due to the incorporationof additional structural defects. For Zn substitutions, a significant concentration of vacancies on the O(4) sites is introduced, whereas Fe substitutions result in a gradual increase in structural disoder of a more general type. Evidence for this disorder is found on both the oxygen sublattice, e.g. partial filling of sites in the La plane at z = 1 2, and the cation sublattice, with some intermixing of the La and Ba ions.",
author = "Slater, {P. R.} and Wright, {A. J.} and C. Greaves",
year = "1991",
month = nov,
day = "10",
doi = "10.1016/0921-4534(91)90773-R",
language = "English",
volume = "183",
pages = "111--120",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "1-3",

}

RIS

TY - JOUR

T1 - The effects of partial substitutions of Zn and Fe on the Cu sites in LaBa 2 Cu 3 O 7±x , and a comparison with similar substitutions in YBa 2 Cu 3 O 7-x

AU - Slater, P. R.

AU - Wright, A. J.

AU - Greaves, C.

PY - 1991/11/10

Y1 - 1991/11/10

N2 - The structural effects of Zn and Fe substitutions in LaBa 2 Cu 3 O 7-x have been examined using time-of-flight neutron powder diffraction, and compared with previous data relating to similar studies of YBa 2 Cu 3 O 7-x . Although the Fe and Zn ions display a similar site preference (for Cu(1) and Cu(2), respectively) in both systems, significant structural differences have been found. In particular, higher concentrations of dopant are possible in LaBa 2 Cu 3 O 7±x (up to 25% Cu replacement by Zn and 66% replacement by Fe), and superconductivity is rapidly destroyed due to the incorporationof additional structural defects. For Zn substitutions, a significant concentration of vacancies on the O(4) sites is introduced, whereas Fe substitutions result in a gradual increase in structural disoder of a more general type. Evidence for this disorder is found on both the oxygen sublattice, e.g. partial filling of sites in the La plane at z = 1 2, and the cation sublattice, with some intermixing of the La and Ba ions.

AB - The structural effects of Zn and Fe substitutions in LaBa 2 Cu 3 O 7-x have been examined using time-of-flight neutron powder diffraction, and compared with previous data relating to similar studies of YBa 2 Cu 3 O 7-x . Although the Fe and Zn ions display a similar site preference (for Cu(1) and Cu(2), respectively) in both systems, significant structural differences have been found. In particular, higher concentrations of dopant are possible in LaBa 2 Cu 3 O 7±x (up to 25% Cu replacement by Zn and 66% replacement by Fe), and superconductivity is rapidly destroyed due to the incorporationof additional structural defects. For Zn substitutions, a significant concentration of vacancies on the O(4) sites is introduced, whereas Fe substitutions result in a gradual increase in structural disoder of a more general type. Evidence for this disorder is found on both the oxygen sublattice, e.g. partial filling of sites in the La plane at z = 1 2, and the cation sublattice, with some intermixing of the La and Ba ions.

UR - http://www.scopus.com/inward/record.url?scp=0026258996&partnerID=8YFLogxK

U2 - 10.1016/0921-4534(91)90773-R

DO - 10.1016/0921-4534(91)90773-R

M3 - Article

AN - SCOPUS:0026258996

VL - 183

SP - 111

EP - 120

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 1-3

ER -